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Your file isn't a gzip file. so the -z flag (to use gzip) is failing. You
need to do file filename.tar.gz. That might tell you what it really is.
Remember in UNIX the extension doesn't mean anything. I can name my files
.gz no matter what type they are. I might be a simple tar file but I would
guess not.

Yeah that other poster that suggested to run file happened to be me
I don't doubt it isn't gziped. Not only that I also posted that just
because the extension happens to be .gz that doesn't mean anything.
You HAVE to file it in order to have a clue what it is.

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